Impulse-transmitting device.



A. H. ADAMS. IMPULSE TRANSMITTING DEVICE. APPLICATION FILED DEC.28. ms.

Patented Aug. 28, 1917.

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lMPULSE TRANSMITTING DEYICE. APPUCATION HLHJ 05c. 2a. 1915.

1 ,238,076. Patented Aug. 28, 1917.

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y 'mr' UNITED STATES PATENT OFFICE.

ARTHUR H. ADAMS, 0]? SPARKILL, NEW YORK, ASSIGNOR TO WESTERN ELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

IMPULSE-TRANSMITTING DEVICE.

citizen of the United States, residing at Sparkill, in the county of Rockland and State of New York, have invented certain .new and useful Improvements in Impulse- Transmitting Devices, of which the following is a full, clear, concise, and exact description.

This invention relates to impulsetransmitting devices or senders, and more particularly to impulse transmitting devices for use in automatic and semiautomatic systems. 1 Heretofore impulse trananitting devices have been designed to provide one complete interruption in the controlling circuit of the mechanism to be controlled, for each movement of the mechanism.

The object of this invention is to provide a new type of sender which controls the op-. eration of the mechanism to be controlled both by each opening and closure of the controlling circuit instead of by each complete interruption. The advantage obtained y using such a sender is that less time is required for sending a series of impulses. For example, only five complete interrup- .tions in the controlling circuit are necessary to move the controlled mechanism ten steps.

One feature of this invention is the provision of two normal positions for the interrupter.

Another feature is the provision of means for producing long and short openings in the controlling circuit.

These and other features will be more readily understood by having reference. to the drawings, in which Figure 1 is a perspective view of the impulse transmitting device with portions of the shaft broken away to more clearly show the mechanism;

Fig. 2 is a code or schematic showing of the time of interruptions in a controlling circuit produced b this impulse transmitting device for di erent number selections; and

V Specification of Letters Patent. Application and December as, me. Serial No.

Patented Aug. 28, 1917.

Fig. 3 shows diagrammatically a suitable circuit arrangement to be used with this impulse transmitting device when controlling a step-by-step selector switch.

Referring to Fig. 1 a shaft 1 is rotatably mounted in a casing (not shown). A fin er wheel or dial 2, provided with a plurality of openings 3, each of which has a number associated therewith, is rigidly secured to one end of the shaft 1. A notched wheel 5 is rotatably mounted on the shaft 1. Pawl 6, pivotally mounted on rod 7 which projects from the dial 2, serves to rotate the notched wheel 5 with the shaft 1 when the dial 2 is rotated clockwise. A spring 8 functions to hold the pawl 6 in engagement with the wheel5. When the dial is moved in a counter-clockwise direction, the toothed wheel 5 is prevented from rotating by a teeth. The pur ose of thefiiflerent length of the teeth wil be hereinaftensdescribed.

A lever 18 is pivoted to an extension 19 of the casin One end of this lev'er engages the cam 1 and the other end engages an msulating segment 22 on contact spring 20.

A spiral ring 9, one end of whlch is attached to t e shaft 1, and the other end to anextension23 of the casing, is provided to rotate the' shaft 1 in a counter-clockwise" direction. 30 represents a governor secured to the shaft 1, the parts of the governor being omitted as they ,do not form a part of this invention.

In the operation of the device the finger dial 2 is rotated in a clockwise irection in the usual manner until the finger of the operator reaches a stop 4. The rotation of the finger wheel rotates the shaft and the cam 17, and also winds the spring 9 which, when the finger dial is released, rotates the dial, shaft and cam 17 counter-clockwise. The dial 2 carries with it the pawl 6 which the in its forward ll'lOVQliltJlt causes the notched wheel 5 to move with the shaft 1. A dog 12 is pivotally mounted on a rod 13 and is keptin engagement with the toothed wheel 5 by a spring 11. The pawl U and the dog 12 are so arranged that, whenever an odd number is dialed, wheel 5 will he moved so that it will be left in such a position that the dog 12 is in a notch of the wheel, and when an even number is dialed, the dog will he left on a tooth. In the case when an even numher is dialed, and the dial is rotated counterclockwise by the spring 9, a rod 15 secured to the dial engages the dog 12 and stops the dial in the position shown in Fig. 1. In the case when an odd number is dialed, the dog 12 is in a notch of the wheel 5, so that the rod 15 does not engage the dog 12, but engages instead a stop 16 of the casing. This allows the dial to move to a different normal position than that shown in Fig. 1. The purpose of having these two normal positions may 'he readil understood by reference to Fig. 2, in which the solid lines represent closures, and the light lines represent interruptions of the circuit.

It will he noted that after the controlling circuit is first closed, the first interruption thereof is etl'ective. i. e., it causes the controlled mechanism to make one step. The end of the first short interruption causes the second step; the beginning of the next interruption the third step and so forth until either a long closure or a long interruption occurs. \Vhen such a closure or interruption occurs, it causes a changeover, that is. alteration in the controlling circuit whereby the next series of stepping impulses is separated from the preceding series and is recorded on ditl'crcnt apparatus or in a diii'crent way on the same apparatus. After the changeover, the beginning of the next stepping series must always be an opening. in the case when an cvennumber is dialed. it will be obvious from Fig. 2 that the impulse sending device. upon returning to the normal position shown in Fig. 1, with lever 15 in position A on the cam 1?,the last impulse is a long closure and the cir cuit leading from springs it) and 21 will he kept closed. ln the rasc when an odd number is dialed. the impulse sending device will return to a normal position in which the rod 15 is in engagement with the exteir sion 1 as above described. in this case. the lever 18 will he in position I) on the cam IT. and the last counting impulse sent will he produccd h v the opening ol springs '20 and '11 when tooth J13 engages the lever 1 Since the tooth 2U has a long suri'acc. lhc circuit leading l'roiu springs 20 and ll will he kept open a long period of hue rclati,vc to the other openings. and. therefore,

changeover will take place. It is believed that the operation will be more clearly understood by an illustration.

Let us assume that the controlled mechanism is to he moved five steps. The operator will then place his finger in the opening on the dial opposite the numeral 5 and operate the dial in the usual manner. During the clockwise rotation of the shaft, the teeth of cam 17 engage the lever 18, but it is rotated away from the insulating segment 22. A light spring 31 is provided to keep the lever 18 in engagement with the segment 22. \Vhen the finger of the operator reaches the stop 4, cam 17 will have been rotated so that the lever 18 will be in position 0 thereon. When the dial is released, the tooth 24 engages the lever 18 and rotates it in a direction to separate springs '20.and 21, thereby producing the first step of the switch. Then a circuit is closed during the period of rotation of the cam in which the lever 18 is in the notch between teeth 21 and 25, thereby producing the second step of the switch, and so forth until tooth 26 engages lever 18. This separates the springs .20 and 21, and opens the controlling circuit to produce the fifth step, but since this tooth is wider than the others, the springs are separated for a longer period of time. thereby producing a longer opening in the ci'introlling circuit which allows changeover to take place. As above described. the shaft is rotated counter-clockwise until rod 15 engages extension 16;

Fig. -i illustiatcs iliagrannnatically only so much of a telephone system as is necessar for an uiulerstanding of the operation of this invention when used to control a. selector switch.

The selector which the sender is arranged to control is of the general step-hv step tvpe in which the brush shaft is stepped in its primary movement to select a group of trunks. and then in its secondary movement to pick out an idle trunk from the selected group. For the purpose of this invention, two primar magnets are provided. one being energized to move the switch one step when the line relay is energized, and the other magnet being energized when the line rcla v dccncrgizes to move the switch another step. It is believed that the circuit arrangement will he more clearly understood from the following description.

'hen the subscriber at substation A. removes his receiver. his line is cxtcnded to the selector in the well-known manner by the opcration of either a line switch or ii linc .lindcr.

cir uit is thereupon completed for line rc la v 101 from grounded hatter). left-hand winding of rela v llll. ci-inductor 1 sideswitch wiper ltlii, \vipcr 1.30, conductor 101, through the loop of the calling subscriber A, conductor 105, wiper 151, side switch 106, conductor 107, right-hand winding of relay 101 to ground. Relay 101 is energized and at its armature and front contact completes a circuit for slow-release relay 108, from grounded battery, winding of relay 108, conductors 109 and 110, armature and front contact of relay 101 to ground.

The subscriber at substation A now oper ates the sender S to send a series of impulses. Upon the first interruption of the line circuit, relay 101 is deenergized, and a circuit for slow-release relay 112 is completed from battery, outermost right-hand armature and front contact of relay 108, conductor 111, winding of relay 112, side-switch arm 133, conductors 113 and 114, armature and back contact of relay 101 to ground. Relay 112 becomes energized and closes the following circuit for primary magnet 115 at its inner armature and front contact: grounded battery, primary magnet 115, conductor 117, middle right-hand armature and front contact of relay 108, conductor 118, inner armature and front contact of relay 112, conductor 119, right-hand winding of relay 123, conductor 114, armature and back contact of relay 101 to ground. Primary magnet 115 is energized and advances the brush shaft one step.

When the line circuit is closed at sender A, relay 101 is again energized and closes at its armature and front contact a circuit for primary magnet 116 from grounded battery, primary magnet 116, conductor 120, innermost right-hand armature and front contact of relay 108, conductor 121, outermost armature and front contact of relay 112, con ductor 122, left-hand windin of relay 123, conductor 110, armature {UK front contact of relay 101, to ground. Primary magnet 116 is thus energized, and advances the brush shaft another step. In a like manner for each openin and closing of the line circuit by sender S, the brush shaft is advanced step-by-step under control of primary magnets 115 and 116. Since relays 108 and 112 are slow-releasing, they do not release their armatures during the rapid vibration of the armature of the line relay 101.

Let us assume that an odd number of impulses is sent. From Fig. 2, it will be seen that the last impulse transmitted is produced by a long opening in the line circuit. The circuit for primary magnet 115 will be closed by this opening of the line circuit in the same manner as above described, except that the circuit will be kept closed for a sufficiently long period to allow relay 123 to become energized.

During the transmitting of the impulses, relay 123 remains deenergized, as the circuits through its windings are not closed for a sufficient length of time to attract the armaa description of the connector ture thereof which is made slow to pull up. Each winding of the relay is wound in a different direction so that when a circuit is closed through one, a magnetic field of a certain polarity is set up, but before the relay can become fully energized, the circuit is open and a field of opposite polarity is started by the circuit being closed through the other winding of the relay. Since relay 101 is decnergized for a long period of time in the case assumed, the circuit for slow-release magnet 108 is opened at the armature and front contact of relay 101 for a sufficient length of time, allowing the magnet 108 to become deenergized. At the outermost armature and back contact of relay 108, the circuit for slow-release magnet 112 is opened, causing relay 112 to become dcenergized, so that when the line relay 101 is again energized by the sender S reaching its normal position, the circuit for primary magnet 116 is open at the outer armature and front con tact of relay 112, thus preventing the brush shaft advancing another step.

Relay 123 becoming energized closes at its right-hand armature and front contact a circuit for escape magnet 124 from grounded battery, escape magnet 12-1, conductor 125, side-switch arm 126, conductor 127, righthand armature and front contact of relay 123 to ground. Escape magnet 124 becomes energized and moves the side switch into position 2.

In position 2 of the side switch, a circuit is completed for secondary magnet 128 as follows: grounded battery, winding of magnet 128, conductor 129, armature 130 and back contact of magnet 128, conductor 131, side-switch arm 132 to ground. Since the circuit for this magnet is completed through its armature and back contact, the switch is advanced step by step until an idle trunk is found. The idle condition of a trunk is re resented bythe presence of ground at ti: test termiriii'f and the busy condition of trunks is indicated by the absence of such ground. When contact is made with an idle trunk, escape magnet 124 will become energized over the following circuit to move the side switch into its third position: grounded battery, winding of escape magnet 124, conductor 125, side-switch arm 126 in its second position, conductor 134, side-switch arm 135 in its second position, brush to ground.

In the third position of the side switch, the operating circuits for the line relay and secondary magnet are opened, and the subscribers line conductors are extended to the desired trunk over which connection to the called party may be established by. incans of a connector (not shown). lt is not believed circuit arrangenicnt is necessary as it would be similar to that shown for the selector, except that in the second position of the side switch, the conductors corresponding to 120 and 117 would be connected to two secondar magnets which would be actuated by t e last series of impulses.

At the conclusion of conversation, ground will be re-applied to the test terminal of the selected trunk by the release of the preceding switch, at which time a circuit will be completed for release magnet 136 from grounded battery, winding of release magnet 136, conductor 137, off-normal contact 138, conductors 139 and 140 to ground at the connector switch. Ma et 136 closes a locking circuit for itself bm grounded battery, winding of magnet 136, conductor 137, offnormal contact 138, conductor 139, armature and front contact of magnet 136 to ground. Magnet 136, upon becoming energized, releases the selector to its normal position. When the switch reaches its normal position, the circuit for the magnet 136 is broken at the off-normal contact 138.

The side switch is restored in the usual manner, and upon arriving at position 2, maintains ground for the release of the preceding switch over a circuit from ground, armature and back contact of relay 101, conductors 114i, 140, left-hand armature and back contact of relay 123, conductor 141, left-hand armature and back contact of relay 108, conductor 142, side-switch wiper 143, in either first or second positions, to the test conductor of said preceding switch.

What is claimed is: 1

1. In a code impulse transmitting device, a movable cam, means for moving said cam in one direction, means for movin said cam in an opposite direction, norma 1y closed contacts opened and closed a number of times by said cam in said second mentioned direction, and means controlled by the extent of movement of said cam by said first mentioned means for causing the last openin of said springs to be of the same or of a longer-duration than the other openings produced by said cam.

2. In a code impulse transmitting device, a cam movable in a forward and a backward direction, means for moving said cam in both directions, normally closed contact springs arranged to befopcned and closed a number of times all of the same duration by said cam in its backward movement, and means controllediby the forward rotation of said cam for causing the last opening of a series of openings of said springs to be either of the same or of a longer duration than the other openings produced by said cam.

3. Ina code impulse transmitting device, a cam movable in a forward and a backward direction, means for moving szgl c m in both directions, normally clos c ntact springs arranged to be rapidly opened and closed a number of times all of the same ing of said contact springs to be of the same duration as the other openings produced by said cam when even numbers are dialed, and for causing the last opening of said contact springs to be of a longer dura tion when odd numbers are dialed.

4. In a code impulse transmitting device, a cam movable in a forward and a backward direction and having two normal positions, a finger dial for moving said cam in the forward direction from a normal position, means for moving said cam in the backward direction to one of said normal positions, normall closed contact springs arranged to be rapi 1y 0 ened and closed a number of times all 0 the same duration by said cam in its backward movement, said cam being arranged when moved to one of said normal ositions to produce a long opening for the ast opening of said contact springs and when moved to the other of said normal positions to produce all the openings of said contact sprin s of the same duration, and means contro led by the movement of said finger dial in the forward movement for determining the normal position to which said cam is moved by said first mentioned means.

5. In an im ulse transmitting device, a rotatable cam aving two normal positions, a finger dial for moving said cam in a forward direction from a normal position, means for moving said cam in an opposite direction to one of these normal positions, means controlled by the movement of said finger dial for determining to which one of these normal positions said cam is moved by said first mentioned means.

6. In an im ulse transmitting device, a rotatable cam li aving two normal positions, a finger dial for moving said cam in a forward direction from a normal position, means for moving said cam in an opposite direction to one of these normal positions means controlled by the movement of sai dial when even-numbers are dialed for causing said first mentioned means to return said cam to one of its normal positions and when odd numbers are dialed for causing said first mentioned. means to return said cam to the other of said normal positions. 7

7. In an impulse transmitting device, a rotatable shaft, a cam rigidly secured to said shaft and having two normal positions, a finger dial arranged to move said shaft and cam in a forwar direction, means for moving said shaft and cam in the opposite direc= tion, a toothed wheel rotatably mounted on said shaft, means associated with said dial for moving said wheel in a forward direction with said dial,and means controlled by the movement of said wheel for determining to which one of these normal positions said cam trolling contacts, means for opening and .is moved by said first mentioned means. closing said contacts to produce a Series of 8. In an impulse transmitter, means to impulses, and a controlling means operated produce a plurality of sets of circuit chang; to cause the last opening of said contacts in 5 mg impulses by opening and closing a circertain series of impulses to differ in dura- 15 cult, and a controlling means operated to tion from the other openings of the series. close said circuit after a long interval when In witness whereof, I hereunto subscribe the number of said circuit changes in a set my name this eighteenth day of December is odd. A. D., 1916.

1 9. In an impulse transmitter, circuit con- ARTHUR H. ADAMS. 

